function s1_hello(){
echo "hello,world!"
}

function s2_tell_who_i_am(){
whoami
}

function s3_which_distro_do_i_use(){
grep '^NAME='/etc/*-release | awk -F '"' '{printf "NAME=\""$2 "\""}'
}

function s4_view_my_cpu_arch(){
uname -m
}
function s5_show_first_scsi_disk_size(){
lsblk -l | grep disk | grep '^sda'| awk '{match($4, /[0-9]+/,arr);print arr[0]}'
}

function s6_show_main_memory_size_in_megabytes(){
free -m | awk '/Mem:/ {print $2}'
}
s1_hello
s2_tell_who_i_am
s3_which_distro_do_i_use
s4_view_my_cpu_arch
s5_show_first_scsi_disk_size
s6_show_main_memory_size_in_megabytes

